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Carb identification? #3065979
08/07/22 08:30 AM
08/07/22 08:30 AM
Joined: Jan 2003
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Finalnd, Perkele
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jyrki Offline OP
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Anyone recognize this carburetor I have in my car. It has absolutely no markings anywhere. It seems like it's anodized gold, and is a typical Holley style. The fuel inlets are the same as in some Demons I think. With blind power valves and to me seemingly large 91 & 93 jets.

carb01.jpgcarb02.jpg

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Re: Carb identification? [Re: jyrki] #3065980
08/07/22 08:37 AM
08/07/22 08:37 AM
Joined: May 2005
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Apollo, PA.
B1MAXX Offline
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looks like a speedmaster

Re: Carb identification? [Re: jyrki] #3065981
08/07/22 08:37 AM
08/07/22 08:37 AM
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A shed in England
Tig Offline
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I've never seen one in person but I believe this to be a "Pro Comp" carb, Chinese version of a 4150.
Speedmaster appears not to have the screw in bleeds, but again I have no experience with either shruggy

Last edited by Tig; 08/07/22 08:43 AM.

'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
Re: Carb identification? [Re: Tig] #3065983
08/07/22 08:53 AM
08/07/22 08:53 AM
Joined: May 2005
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Apollo, PA.
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I thought procomp and speedmaster was the same company shruggy

Re: Carb identification? [Re: B1MAXX] #3065985
08/07/22 09:06 AM
08/07/22 09:06 AM
Joined: Jan 2003
Posts: 2,902
A shed in England
Tig Offline
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Originally Posted by B1MAXX
I thought procomp and speedmaster was the same company shruggy

Correct, Procomp changed their name to speedmaster around 2014.


'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
Re: Carb identification? [Re: Tig] #3065987
08/07/22 09:13 AM
08/07/22 09:13 AM
Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
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jyrki Offline OP
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Thanks! Seems like one. There doesn't seem to be any numbers anywhere, so it's kind of hard to judge what kind of jets should be in there. The size is supposed to be 850, but I have no idea weather it's true or not. Anyway, for that size, 91&93 jets seems awfully big, and according to the plugs it runs rich = black plugs. And the idle screws can only be open about 1/4 turn or it's too rich. I think I'll drop the jet sizes 3 in the rear and 10 in front, and install a power valve in front. See how that affects the idle, or do I have to try to change the idle air bleeds to bigger size.


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Re: Carb identification? [Re: jyrki] #3065992
08/07/22 09:26 AM
08/07/22 09:26 AM
Joined: May 2005
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Apollo, PA.
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Jetting won't effect idle circuits.

Re: Carb identification? [Re: B1MAXX] #3066015
08/07/22 11:13 AM
08/07/22 11:13 AM
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Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Originally Posted by B1MAXX
Jetting won't effect idle circuits.
Shouldn't affect the idle circuit UNLESS the throttle plates are open far enough to expose the transition circuits on some carbs shruggy scope


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Carb identification? [Re: Cab_Burge] #3066027
08/07/22 12:04 PM
08/07/22 12:04 PM
Joined: May 2005
Posts: 1,944
Apollo, PA.
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Transition slots are still from idle circuit. Idle feed restriction is the only "jet"on that side.

Re: Carb identification? [Re: B1MAXX] #3066050
08/07/22 02:17 PM
08/07/22 02:17 PM
Joined: Jan 2003
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jyrki Offline OP
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Ok. Anyway, I'll put in smaller jets all around + the power valve. Then I think again if I want to play with the idle restrictions. I think it was way too rich overall. Next weekend we'll see how it reacts, weather permitting.


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